Mohammadian came first at the Men's Shot Put F42/61/63 with a throw of 15.27m as well as setting an Asian record.
Bandara Halgahawela from Sri Lanka won the silver with 13.21m.
Bronze medal went to Uzbekistan’s Mukhammad Rikhsimov with 13.12m.
About 3,000 athletes with disabilities from a record 43 countries and territories are taking part in the games that opened in the Indonesian capital on Saturday.
The Asian Para Games will run through October 13.